Testing General Relativity with NuSTAR Data of Galactic Black Holes
Ashutosh TripathiCenter for Field Theory and Particle Physics and Department of Physics, Fudan University, 200438 Shanghai, People's Republic of China; [email protected]Yuexin ZhangKapteyn Astronomical Institute, University of Groningen, 9747 AD Groningen, The NetherlandsAskar B. AbdikamalovCenter for Field Theory and Particle Physics and Department of Physics, Fudan University, 200438 Shanghai, People's Republic of China; [email protected]Dimitry AyzenbergTheoretical Astrophysics, Eberhard-Karls Universität Tübingen, D-72076 Tübingen, GermanyCosimo BambiCenter for Field Theory and Particle Physics and Department of Physics, Fudan University, 200438 Shanghai, People's Republic of China; [email protected]Jiachen JiangDepartment of Astronomy, Tsinghua University, 100084 Beijing, People's Republic of ChinaH. LiuCenter for Field Theory and Particle Physics and Department of Physics, Fudan University, 200438 Shanghai, People's Republic of China; [email protected]Menglei ZhouInstitut für Astronomie und Astrophysik, Eberhard-Karls Universität Tübingen, D-72076 Tübingen, Germany
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Abstract Einstein’s theory of General Relativity predicts that the spacetime metric around astrophysical black holes is described by the Kerr solution. In this work, we employ state-of-the-art relativistic reflection modeling to analyze a selected set of NuSTAR spectra of Galactic black holes to obtain the most robust and precise constraints on the Kerr black hole hypothesis possible today. Our constraints are much more stringent than those from other electromagnetic techniques and, with some sources, we find stronger constraints than those currently available from gravitational waves.
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